Bobbin retainer



Marci; m, ma

Hill

G. WOLF www BOBBIN RETAINER Filed June 24, 1935 Patented Mar. O, 1936 sTATs PATNT BOBBIN RETAINER tion of Missouri Application June 24, 1935, Serial No. 28,078

9 Claims.

The invention relates to stitchers and is particularly applicable to shoe stitching machinery and consists in a device for retaining the bobbin case, and enclosed bobbin, within the housing provided therefor in association with a rotating shuttle.

The main objects of the invention are to facilitate removal and application of the bobbin case and to provide maximum clearance around the bobbin case for accommodating the manipulation of the shoe being stitched, particularly high heeled shoes, where the heel is likely to interfere with the bobbin retainer.

The accompanying drawing illustrating the i invention does not illustrate the stitcher, which may be of any familiar type. In the drawing- Figure 1 is a front View of the shuttle case and associated parts including the bobbin retainer and a. shoe being worked upon is indicated in broken lines.

Figure 2 is a side elevation of the same structure with the bobbin retainer shown in function-l ing position in full lines and in bobbin releasing position in broken lines.

Figure 3 is a top view of the structure with the bobbin retainer shown in bobbin releasing position.

A portion of the machine frame is indicated at I and includes a case 2 for the shuttle 3 in Which the bobbin case 4 is mounted. A bracket 5 is secured to a lug 20 on case I and projects outwardly and upwardly from the case to provide a lug 6 for mounting a bobbin case retainer 'I and its holding mechanism. 'Ihe retainer 'I has upwardly extending ears 8 straddling lug 6 and pivoted thereon by a pin 9 having a shouldered hd I I. A coil spring 28 is anchored at one end in a recess in one ear 8 and at the other end in a recess in pin head I I and this spring is tensioned so as to thrust retainer I outwardly and upwardly from the full line position, shown in Figure 2, to the broken line position. Pin 9 is squared at 9a and at 9b and a set screw I9 engages portion 9a to hold the pin in position to produce the desired tension on the spring. When retainer 1 is in the raised position shown in broken lines in Figure 2, a screw driver may be applied to the lower end of set screw I9 to loosen the same and release pin 9, which may then be rotated by its squared end 9b. A skirt Il) on pin head I I forms a housing for spring 28.

A spindle I2 is mountedv in lug 6 and projects forwardly therefrom and carries a hand wheel I3 having a depending nger I4 normally engaging the forward face of retainer 'I to hold it in the position shown in Figures 1 and 2 against the thrust of spring 28. A portion of hand wheel I3 is hollow and receives a spiral spring I5 anchored to the wheel and to the spindle and tensioned so as to rotate wheel I3 in a clockwise direction. A stud I 6 on retainer 'I limits the rotation of wheel I3 under the thrust of spring I5. Nuts Il provide adjustment of spindle I 2 forwardly and rearwardly in lug 5 whereby the functioning position of retainer 'l may be regulated lo to vary the clearance between the same and the bobbin case. A work support I8 is illustrated adjacent the lower portion of the shuttle case 2.

Operation: When the operator desires to replace the bobbin, he rotates hand wheel I3 in an 15'" anti-clockwise direction, releasing retainer 'l from the finger I4 and the retainer automatically moves to the dotted line position indicated in Figure 2, uncovering the bobbin receiving recess. The bobbin case is easily removed and the lled il bobbin and case may be inserted. When the retainer 'I is pressed downwardly to its functioning position, spring I5 automatically returns vwheel I3 and finger I4 to the retainer holding position.

All of the above described operation can be s; performed with one hand.

The lower portion of the bobbin retainer is substantially at and occupies very little space in front of the bobbin. Its mounting and the operating device. are located a substantial dis- 1,4) tance above the work support and above the bobbin case. No part of the retainer or of the operating device therefor interferes with the work, even though the latter have an unusually high heel. The latter may be brought close `to the :15 shuttle case on both sides of the needle.

The hand wheel and the outer end of the retainer are always immediately in front of the entire mechanism and are easily manipulated by a single movement by the operator. The device i0 is simple in construction, having few parts to be manufactured and assembled and adequately meets the requirements of such a mechanism. The details of the mechanism may be modified without departing from the spirit of the inven- 45 tion and I contemplate the exclusive use of such modications as come within the scope of my claims.

What is claimed is:

l. In a mechanism of the class described, struc- 50 ture for mounting a bobbin case and bobbin, a retainer for said case carried on said structure and normally located in front of said case but movable away from the same, and a device located forwardly of said structure at al1 times, means 55 for automatically moving said device to position to hold said retainer in its normal functioning position, said device being movable manually out of said position.

2. In a mechanism of the class described, structure for mounting a bobbin case and bobbin, a retainer pivoted on said structure and normally positioned to maintain assembly of said case and structure but movable away from the same by swinging on its pivot, a member projecting forwardly from said structure above said retainer, and a manually operable device mounted on the outer forward end of said member and movable thereon in a plane in front of the pivot for said retainer and paralleling the general plane of said case to hold said retainer in functioning position or to release said retainer.

3. In a mechanism of the class described, structure for mounting a bobbin case and bobbin, a work support adjacent the lower portion of said structure, a retainer for said case mounted on said structure so as to move outwardly and upwardly from said work support, means tending to move said retainer as described, a manually operable member holding said retainer against the action of said means, and means tending to move said member into retainer holding position.

4. In a mechanism of the class described, structure for mounting a bobbin case and bobbin, a work support adjacent the lower portion of said structure, a retainer for said case mounted on said structure so as to move outwardly and upwardly from said work support, means tending to move "said retainer as described, and a manually releasable member holding said retainer against the action of said means and a device tending to move said member into position to hold said retainer in front of said case whenever said retainer is moved to its functioning position in front of said case.

5. In a mechanism of the class described, structure for mounting a bobbin case and bobbin, a retainer for overlying said case and pivoted to said housing, a spring thrusting said retainer upwardly and outwardly to permit application and removal of said case to said structure, a member projecting forwardly from said structure, and a device on said member for holding said retainer against the thrust of said spring and rotatable in a plane paralleling the general plane of said case to release said retainer.

6. In a mechanism of the class described, structure for mounting a bobbin case and bobbin, a

retainer for overlying said case and pivoted tosaid housing, a spring thrusting said retainer upwardly'and outwardly to permit application and removal of said case to said structure, a member projecting forwardly from said structure, a device on said member for holding said retainer against the thrust of said spring and rotatable in a plane paralleling the general plane of said case to release said retainer, and a Spring thrusting said device into retainer holding position automatically when said retainer is moved to functioning position over said case.

'7. In a mechanism of the class described, structure for mounting a bobbin case and bobbin, a retainer for said case and bobbin mounted on said structure and normally located in front of said case but movable away from the same, a member projecting forwardly from said structure above said case, and a device mounted on the outer forward portion of said member for positively holding said retainer in functioning position, said member being adjustable forwardly and rearwardly of said structure to vary the location of said device and retainer when the latter is in functioning position.

8. In a mechanism of the class described, structure loosely mounting a bobbin case and bobbin, a member overlying said case to retain it in assembled relation with said structure, means for moving said member away from said case, and a device on said structure and movable into and out of position to positively hold said member in front of said case, and means adjustably positioning said device on said structure to vary the case retaining position of said member.

9. In a mechanism of the class described, a housing having a recess for receiving a bobbin case and bobbin, a member pivoted to said housing above said recess, a spring thrusting said member outwardly and upwardly away from in front of said recess, a spindle extending forwardly from'said housing above said recess, a device rotatable on said spindle and having a depending nger for engaging the outer face of said member when the latter is in functioning position to hold it against the thrust of said spring, said device being rotatable on said spindle to move said finger away from said member and said spindle being adjustable forwardly and rearwardly on said housing to Vary the clearance between said member and the case.

' EUGENE G. WOLF. 

